To avoid your session rooms bursting at the seams with attendees, you can enable the Room Capacity feature to control headcounts.
- From the admin screen, click on the Event tab, then the Event Options tab, and then click on the Edit details button.
- Click on the checkbox by Enable Room Capacity Validation and click Save
- Now Navigate to the Rooms Tab and click on All Rooms.
- Click on the room you want to add a capacity for.
5. Click Edit Details, change the room capacity value, then click Save.
Note: Attendees will not be able to schedule sessions that have a room value of "0" (zero) on their calendar.